a*b

#include<iostream>
using namespace std;

int anhanb(int a, int b) {
	if (b==1){
		return a;
	}
	else {
		return a + anhanb(a, b - 1);
	}
}
void main(){
	int a, b;
	cout << " nhap  a , b: ";
	cin >> a >> b;
	cout <<anhanb(a, b);
	system("pause");
}